diff --git a/dockercoins/hasher/Dockerfile b/dockercoins/hasher/Dockerfile
index 5e2e9ee0..0c16e783 100644
--- a/dockercoins/hasher/Dockerfile
+++ b/dockercoins/hasher/Dockerfile
@@ -1,4 +1,5 @@
-FROM ruby
+FROM ruby:alpine
+RUN apk add --update build-base
 RUN gem install sinatra
 RUN gem install thin
 ADD hasher.rb /